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The Hong Kong Observatory issued a red rainstorm warning for an hour on Monday night, while a suspected waterspout was spotted off Cheung Chau.
The red signal – the middle level in a three-tier system – was issued at 9.45pm but was cancelled at 10.45pm. An amber warning had been issued earlier, at 7.05pm.
The Observatory said more than 70mm of rainfall had fallen or was expected to fall within an hour in the Wan Chai area.
The forecaster issues a black rainstorm signal when heavy rain exceeding 70mm in an hour has fallen or is expected to fall generally over Hong Kong, and is likely to continue.
Residents in the vicinity were advised to take necessary precautions to avoid possible flood damage, the forecaster said.

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